You have run out of coolant, or the heater matrix is blocked.
Hot air because it is blow out the hot air from the inside of the laptop.
A hair dryer blows hot air out.
Why does my Lincoln LS V8 Blow cold air on one side and hot air on the other side
One of the reasons a 2000 Jeep Cherokee heater would randomly blow cold air and then hot air and then cold might be that there is a problem with the hot/cold duct. The air or a vent might be inadvertently blowing periodically.
If it's cold outside do you want cold air blasting when you get in your car?
You have to get it recharged. you have no freeon left which makes the cold air
no
There is a door behind the dash that changes cold and hot air flows. The door is probable stuck or the control circuit has failed causing the hot air to blow on cold.
It is more effective to bring cold air in for temperature regulation.
All air conditioners work by removing energy from one liquid and putting it in another liquid. Usually, the two liquids are the same. They blow air over the cold liquid which cools the room. They blow air over the hot liquid to the outside. With valves, air conditioners can be made to blow hot air inside and cold air outside. That is called reverse cycle.
You are low on coolant to the heater core.
probably air in the system have you replaced the rad or hoses?